Recall 18V307 covers 96 2016-2018 Newmar Mountain Aire motorhomes for DEF tank bracket contact with the tire. Repair is free at any franchised Newmar dealer.
Newmar is recalling 96 2016-2018 Mountain Aire motorhomes because the Diesel Exhaust Fluid tank bracket can contact the tag axle tire and damage it. Tire damage can lead to tire failure and increase crash risk, and Newmar dealers will complete the recall repair free of charge.
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What's wrong?
The DEF tank bracket on a 2016-2018 Newmar Mountain Aire is the support that holds the diesel exhaust fluid tank in place. DEF is the fluid the diesel emissions system uses to help treat exhaust. The bracket is supposed to keep that tank secure and clear of the nearby tag axle tire, the rear axle tire that helps carry the motorhome's weight.
On affected motorhomes, the DEF tank bracket installed by Spartan Motors sits close enough to contact the tag axle tire. As the tire turns, contact with the bracket can scrape or wear the tire. Tire damage on a heavy motorhome can raise the risk of a crash or property damage.
There is no warning sign before failure. Because the filing does not list a driver symptom, an owner should not count on a noise, a warning light, or a change in handling before tire damage starts.
Who's affected?
Covers the same tire and diesel fuel system components across the 2016, 2017, and 2018 model years.
| 2017 Newmar Mountain Aire | tire |
|---|---|
| 2017 Newmar Mountain Aire | fuel system |
| 2016 Newmar Mountain Aire | tire |
| 2016 Newmar Mountain Aire | fuel system |
| 2018 Newmar Mountain Aire | tire |
| 2018 Newmar Mountain Aire | fuel system |
| Units affected | 96 |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific motorhome is included.
What's the safety risk?
If the DEF bracket damages the tire, the tire can fail and raise crash risk. Until the repair is complete, avoid driving on a tire that shows bracket contact or damage, and schedule service soon. Repair is free at any franchised Newmar dealer.
What should I do?
- Check your VIN to confirm your 2016-2018 Newmar Mountain Aire is included in this recall.
- Contact a franchised Newmar dealer to schedule the free DEF bracket relocation that moves the bracket away from the tag axle tire.
- Bring the recall notice if you have one. If not, reference recall number 18V307 when you call.
- Inspect the tag axle tire before each trip and stop using the motorhome if the DEF bracket has contacted or damaged the tire.
What happens at the repair
At the dealer, a Newmar technician moves the DEF tank bracket away from the tag axle tire so the bracket no longer contacts the tire. The recall repair is free, and parts and labor are covered for the bracket positioning work described in the campaign. Because the remedy is available, owners with an included VIN can arrange the dealer repair through Newmar customer service or their dealer.
Timeline
| May 11, 2018 | NHTSA published the recall |
|---|---|
| June 21, 2018 | Owner notification mailed |
| July 10, 2018 | Dealer notification began |
| July 10, 2018 | Dealer notification ended |
| July 10, 2018 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| July 10, 2018 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 18V307?
Recall 18V307 covers 96 2016-2018 Newmar Mountain Aire motorhomes with a Diesel Exhaust Fluid tank bracket that can contact the tag axle tire. If the bracket damages the tire, the tire can fail and increase crash risk. Newmar will fix the bracket location for free.
What should I do if my 2016-2018 Newmar Mountain Aire is on this recall?
Check your VIN to confirm your specific motorhome is included in recall 18V307. If it is, contact Newmar customer service at 1-800-731-8300 or an authorized Newmar service location to arrange the free DEF bracket repair.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. For recall 18V307, Newmar will have the DEF tank bracket moved away from the tire free of charge.
Is it safe to drive my Newmar Mountain Aire before the repair?
The recall does not include a do-not-drive order. The safety risk is tire damage from DEF bracket contact, which can lead to tire failure and increase crash risk. Confirm your VIN, then arrange the free repair before relying on the motorhome for a trip.
What if I bought my Newmar Mountain Aire used?
The free recall repair still applies. Federal recall law follows the vehicle, not the first owner. Check your VIN to confirm whether your specific Mountain Aire is included, then reference recall 18V307 when you call Newmar or the service location.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/18V307000 |
|---|---|
| Newmar customer service | 1-800-731-8300 |
| NHTSA recall # | 18V307 |
| NHTSA recall # (full) | 18V307000 |
Source documents
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 25, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →